Graphite as a potassium ion battery anode in carbonate-based electrolyte and ether-based electrolyte

The graphite as the potassium ion battery anode is studied in KPF6-EC/DMC and KPF6-DME electrolytes. It is found that the graphite demonstrates superior rate performance with a capacity of 87 mAh g−1 at a current rate of 10 C (corresponding to 2.8 A g−1) and excellent capacity retention ability of 84% after 3500 cycles in DME-based electrolyte. Moreover, its initial coulombic efficiency is 87.4%, higher than 69.6% in EC/DMC-based electrolyte....